hifi engine

JVC 4vr 5456

Hello all, I have an old JVC receiver from the 70's(?) that I am trying get going; when connected it lights up, etc. However, I cannot get any sound from the speakers- although there have been a few murmurs with the volume turned up. The speakers are fine- 8 ohms.Are there fuses for the speakers?. I know that similar receivers(sansui, f.ex) from that period use fuses that are replaceable. This has one fuse that can be accessed, but it runs the whole system.